Goodman Furnace: Check blower (inducer) pressure switch
Check blower (inducer) pressure switch on a Goodman furnace: The pressure control stops combustion if venting is restricted or blocked. A/GMVC96 and A/GCVC models also have a front cover pressure switch in series with the gas valve. It blocks the valve if condensate backs up in the secondary heat exchanger.
Applies to: Blower pressure switch and front cover pressure switch
Common causes of check blower (inducer) pressure switch
- Restricted or blocked vent pipe
- Improperly connected or plugged condensate drain
- Defective pressure switch
How to fix check blower (inducer) pressure switch: step by step
- Shut off power and remove the burner compartment door.
- Remove the wires from the pressure switch terminals.
- Disconnect the pressure hose and connect an inclined manometer through a 1/4 in. tee to the inducer tap.
- With an ohmmeter across the switch terminals and the inducer running, the switch should close.
- If it does not close, compare the negative pressure to the switch closing point.
- If the pressure is fine, replace the switch. If pressure is low, check the inducer and venting.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service manual, p. 53. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.